CN116428375A

CN116428375A - Offset valve seat and orifice plate adjusting gate valve using same

Info

Publication number: CN116428375A
Application number: CN202310319442.1A
Authority: CN
Inventors: 明友; 王渭; 耿圣陶; 余宏兵; 陈凤官; 叶晓节; 徐亭亭
Original assignee: HEFEI GENERAL ENVIRONMENT CONTROL TECHNOLOGY CO LTD; Hefei General Machinery Research Institute Co Ltd
Current assignee: HEFEI GENERAL ENVIRONMENT CONTROL TECHNOLOGY CO LTD; Hefei General Machinery Research Institute Co Ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-07-14

Abstract

The invention belongs to the technical field of regulating valves, and particularly relates to a bias valve seat and a pore plate regulating gate valve using the bias valve seat. The offset valve seat comprises a valve seat body, a cylinder cavity of the valve seat body forms a window for medium to pass through, and the offset valve seat is characterized in that: the window is an eccentric channel, and the eccentric distal end of the window is positioned on the side where the valve rod is positioned; the medium can flow in the middle of the pipeline when the valve is at a small opening degree, so that the problem of erosion and abrasion of the high-speed flowing medium to the wall of the valve cavity and the wall of the pipeline at the outlet of the valve when the valve is at a small opening degree is effectively avoided, and the actual service life of the regulating valve and the pipeline at the outlet of the valve is finally effectively ensured.

Description

Offset valve seat and orifice plate adjusting gate valve using same

Technical Field

The invention belongs to the technical field of regulating valves, and particularly relates to a bias valve seat and a pore plate regulating gate valve using the bias valve seat.

Background

The coal gasification chilling flow is characterized in that coal slurry (coal dust) and pure oxygen are sprayed into a gasifier through a burner, partial oxidation reaction is carried out under the conditions of the pressure of 4.0-6.5 MPa and the temperature of 1300-1500 ℃, raw coal gas and slag generated by the reaction are mixed together, chilled water sprayed by a chilling ring at the bottom of a hearth is chilled, and then enters a chilling chamber water bath through a downcomer to carry out gas-liquid separation in the chilling chamber; the slag is then discharged through a lock hopper system to achieve continuous operation of the gasifier. The medium flowing in the coal chemical chilling water treatment section in the coal gasification chilling flow is a liquid-solid two-phase flow medium of black water and ash water, and contains gasified gas of coal, solid of coal and even liquid generated by coal gasification chilling, and heat is required to be recovered through a flash tower; however, when the liquid-solid two-phase flow medium with high-hardness solid particles directly enters the flash tower through the pipeline, serious scour and abrasion are inevitably caused on a regulating valve, a pipe wall and even an scour prevention piece arranged in the flash tower, so that equipment is frequently maintained, normal production is influenced, and the service life of the equipment is greatly reduced. In addition, as the regulating valves used in the environment are all in a single sealing surface state, the pressure sealing purpose is realized only by means of high pressure of the medium; once the pressure of the medium is reduced, the liquid-solid two-phase flow medium can infiltrate into the sealing surface, so that the medium leakage problem is caused, the sealing surface can be damaged due to strong scouring of the medium, and the maintenance and even the replacement of the regulating valve can be stopped, thereby bringing great trouble to the on-site maintenance work.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides the offset valve seat, which can ensure that media can flow in the middle of a pipeline when the valve is at a small opening degree, so that the problem of erosion and abrasion of the high-speed flowing media on the wall of a valve cavity and the wall of the pipeline at the outlet of the valve when the valve is at the small opening degree is effectively avoided, and finally the actual service life of the regulating valve and the pipeline at the outlet of the valve is effectively ensured.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the offset valve seat comprises a valve seat body, wherein a barrel cavity of the valve seat body forms a window for medium to pass through, and the offset valve seat is characterized in that: the window is an eccentric channel, and the eccentric distal end of the window is positioned on the side of the valve rod.

Preferably, the cross section is taken along the radial direction of the valve seat body, and the cross section profile of the window is lip-shaped or rectangular or N-shaped or C-shaped or circular.

Preferably, when the cross section of the window is in a lip shape or an N-type or C-type, an arc formed by the eccentric distal end of the window on the cross section and an arc formed by the outer wall of the valve seat body on the cross section form a concentric circle structure.

Preferably, the orifice plate is adjusted the gate valve, this orifice plate adjusts the gate valve and uses the stated offset valve base, its characterized in that: the valve comprises a valve body, wherein a valve cavity for fluid to pass is arranged on the valve body in a penetrating way, and a valve seat body with a window is coaxially arranged in the valve cavity; the valve plate is driven by a valve rod with a power source so as to perform linear reciprocating motion along the radial direction of the valve cavity; the valve cavity is internally provided with a forced sealing wedge block, and a fit clearance for clamping and positioning the valve plate is formed between the forced sealing wedge block and the valve seat body, so that after the valve plate is clamped into the fit clearance, the valve plate can be pressed on the fit sealing surface of the valve seat body by means of the pressure of the forced sealing wedge block and the valve seat body.

Preferably, the forced sealing wedge block is provided with a guiding chamfer, and the valve plate is correspondingly provided with a matching chamfer with the same angle with the guiding chamfer, so that after the valve plate is clamped into the matching gap, the guiding chamfer and the matching chamfer form a wedge-shaped compression fit with a surface fit.

Preferably, the shape of the forced sealing wedge is in a cylindrical pin shape with an axis parallel to the axis of the valve rod.

Preferably, the valve plate profile matches the window profile.

Preferably, the valve outlet of the valve cavity is in an outward-expanding horn-shaped structure, and the liquid inlet of the valve outlet is in smooth transition with the liquid outlet end of the window at the valve seat body.

Preferably, the angle between the lower straight line of the valve outlet and the horizontal plane is larger than the angle between the upper straight line and the horizontal plane on an axial section which is coincident with the axis of the valve rod and the axis of the valve cavity at the same time.

Preferably, the lowest part of the window is arranged at the same height as the top surface of the forced sealing wedge block on the axial section which is coincident with the axis of the valve rod and the axis of the valve cavity.

The invention has the beneficial effects that:

1) Through the scheme, the invention provides the offset valve seat, the window of the offset valve seat adopts smart eccentric layout, and the eccentric direction is more upward relative to the axis of the valve seat body, namely the direction of the valve rod. Therefore, when the valve is small in opening degree, the medium travelling at high speed can be sprayed into the pipeline at the outlet of the valve along the middle of the pipeline as far as possible, but does not travel at high speed against the pipeline wall as in the conventional valve, so that the direct scouring phenomenon of the liquid-solid two-phase flow medium with high-hardness solid particles to the pipeline wall and even the valve cavity wall is reduced or even avoided, and the effect is remarkable.

Therefore, the invention can ensure that the medium can flow in the middle of the pipeline when the valve is at the small opening, thereby effectively avoiding the problem of the scouring abrasion of the medium flowing at high speed to the wall of the valve cavity and the wall of the pipeline at the outlet of the valve when the valve is at the small opening, and finally effectively ensuring the actual service life of the regulating valve and the pipeline at the outlet of the valve.

2) For the window, the appearance can be various design structures, for example, the cross section appearance of the window is lip-shaped or rectangular or N-shaped or C-shaped or circular, and the like, and the window can be selected according to practical situations. When the cross section appearance of the window is lip-shaped or N type or C type, the arc line that the eccentric distal end of window formed on the cross section and the arc line that the valve seat body outer wall formed on the cross section constitute concentric circle structure, namely both arc lines equidistance setting each other.

3) On the basis of the structure, the invention also provides an orifice plate adjusting gate valve applying the offset valve seat. When the valve is used, on one hand, the lifting action of the valve plate is utilized, so that high-speed fluid enters the window for the first time and is sprayed along the center of the pipeline as much as possible, and the function of protecting the pipeline wall at the outlet of the valve and even the valve cavity wall is realized. On the other hand, the invention additionally designs the forced sealing wedge block, so that when the orifice plate is used for regulating the gate valve to be fully closed, the plane seal of the matching sealing surface of the valve plate and the valve seat body can be formed by medium force, and a certain sealing specific pressure is formed between the matching sealing surface of the valve plate and the valve seat body by the wedging action formed by the forced sealing wedge block and the front surface of the valve plate. The mechanical and medium double-pressure type sealing structure can enable the sealing effect of the valve to be better, good sealing can be formed even under the condition of low pressure and even sealing failure, and finally the reliable use effect of the valve under the severe environment formed by high-speed advancing of liquid-solid two-phase flow medium is ensured.

4) Considering the smooth matching purpose of the valve plate and the forced sealing wedge block when the valve plate goes down, the valve plate and the forced sealing wedge block are required to be provided with matched chamfers with consistent angles, so that the valve plate can be ensured to be effectively pressed on the valve seat body by the wedge surface matching of the two chamfers, and the valve plate is very reliable and stable to use.

5) The shape of the forced sealing wedge block is cylindrical, so that the cylindrical pin structure occupies small space and the conductivity of the cylindrical surface is utilized, the influence on the running path of the medium in the flow channel is avoided as much as possible, and meanwhile, the condition that turbulence and the like possibly generated in the valve cavity due to large-area blockage of the medium endanger the valve cavity wall is avoided.

6) Because the window adopts an eccentric structure, the valve outlet is correspondingly matched with the window, thereby facilitating medium passing. The included angle between the lower straight line of the valve outlet and the horizontal plane is larger than the included angle between the upper straight line and the horizontal plane, so that the valve seat body can be perfectly matched with the inlet of the pipeline at the existing valve outlet even if the valve seat body is greatly changed, and the valve outlet is convenient and rapid to assemble.

7) The valve plate and the valve seat of the orifice plate regulating gate valve are subjected to wear-resistant treatment, so that the service life of the valve is effectively prolonged.

8) In the whole adjusting process of the valve plate, the medium flows through the circulation throat diameter formed by the valve plate and the valve seat; compared with other types of valves such as ball valves and butterfly valves with the same specification, the valve has smaller flow resistance and larger flow capacity. Under the same flow requirement, the valve of the invention has relatively large flow capacity, can be selected from valves with smaller caliber, and can be arranged to be shorter, so the invention has the characteristics of short structure and light weight, and is especially suitable for high-speed liquid-solid two-phase flow medium passing occasions.

Drawings

FIG. 1 is a partial cross-sectional view of the present invention in a valve open condition;

FIG. 2 is a left side view of the structure shown in FIG. 1;

FIG. 3 is a partial cross-sectional view of the present invention in a fully closed valve state;

FIG. 4 is a left side view of the structure shown in FIG. 3;

FIG. 5 is a schematic view of the mating state of the guide chamfer and the mating chamfer;

FIG. 6 is a schematic structural view of one embodiment of a valve plate;

fig. 7, 8, 9, 10 and 11 are cross-sectional views of five embodiments of the offset valve seat.

The actual correspondence between each label and the component name of the invention is as follows:

10-valve seat body; 11-window; 11 a-an eccentric distal end;

20-valve body; 21-lower straight line; 22-upper straight line;

30-a valve plate; 31-matching chamfering;

40-a power source; 50-valve rod; 60-forced sealing wedge; 61-guiding chamfer.

Detailed Description

For ease of understanding, the specific structure and operation of the present invention will be further described herein with reference to FIGS. 1-11:

the orifice plate adjusting gate valve of the present invention is constructed as shown in fig. 1-4, and includes a valve body 20, wherein a valve cavity is disposed in the valve body 20, and of course, a valve cover can be correspondingly disposed on the valve body 20 for mounting the power source 40. The valve body 20 has a valve inlet and a valve outlet in communication with a valve cavity in which a valve plate 30, an offset valve seat and a positive seal wedge 60 are disposed. When in operation, the valve plate 30 can move radially relative to the valve cavity, is arranged in a reserved passage above the valve cavity, and forms an opening and closing action with the offset valve seat, thereby controlling the on-off between the valve inlet and the valve outlet. In a specific design, valve plate 30 is connected to a valve core driving unit, i.e., power source 40, outside valve body 20 through a valve rod 50 provided through a valve cover.

As shown in fig. 7 to 11, the offset valve seat has a cylindrical outer shape and includes a valve seat body 10 and a through window 11 provided in the valve seat body 10. The window 11 itself is of an eccentric configuration, i.e. offset from the axis of the valve seat body 10, and the eccentric distal end 11a is required to be disposed upwardly as shown in fig. 7-11, i.e. offset in the direction of the valve stem 50.

In addition, as shown in fig. 1, 3 and 5-6, the end of the valve plate 30 facing the valve seat body 10 forms a main sealing surface, so that the main sealing surface can be pressed against the mating sealing surface of the valve seat body 10 under the action of the medium pressure, thereby realizing the valve path closure. Meanwhile, a forced sealing wedge block 60 is also arranged in the valve cavity, and the forced sealing wedge block 60 is fixed on the valve body 20 and is parallel to the valve plate 30; the back of the forced sealing wedge 60 is provided with a guiding chamfer 61 with an oblique angle for matching with the matching chamfer 31 at the valve plate 30 as shown in fig. 5, so that wedge surface pressing is realized between the forced sealing wedge and the valve plate 30 when the valve is fully closed, and the forced sealing effect between the valve plate 30 and the valve seat body 10 is further ensured.

When the throttle portion at the lower end of valve plate 30 is shaped like a lip as shown in fig. 6, it can be better matched with lip-shaped window 11 shown in fig. 2 and 7. Of course, the shape of the throttling portion may be other configurations to adapt to the window 11 of other configurations, which will not be described herein. Correspondingly, the window 11 can also be rectangular, N-shaped, C-shaped, circular, etc., as shown in particular with reference to FIGS. 7-11. When in use, the medium from the valve inlet enters the circulation throat diameter formed by the valve plate 30 and the valve seat body 10 through the lip-shaped throttling part at the lower end of the valve plate 30, so that the regulation function of the medium flow can be realized.

In actual operation of the present invention, a lip-structured window 11 as shown in fig. 7 is taken as an example:

1. when valve plate 30 is slid upward relative to valve seat body 10 until the entire through lip configuration window 11 is fully exposed, the valve is fully open, at which point the valve can pass through a maximum flow rate, as shown in fig. 1-2.

2. When the valve plate 30 slides downwards relative to the valve seat, the valve is fully closed until the whole window 11 with the penetrating lip-shaped structure is fully closed, no flow passes through the valve, wedge surface sealing is realized between the forced sealing wedge 60 and the valve plate 30, and plane sealing is realized between the valve plate 30 and the valve seat body 10 under the combined action of medium force and the forced sealing wedge 60.

3. When the valve plate 30 slides up and down relative to the valve seat, the exposed area of the window 11 is changed according to the flow requirement, namely, the online change of the flow throat diameter is realized, and finally, the online regulating function of the medium flow is realized.

In practical design, it should be noted that the position of the window 11 of the present invention must be biased above the pipeline to ensure that the medium can flow in the middle of the pipeline when the valve is at a small opening, so as to effectively reduce or even avoid the problem of erosion and abrasion of the valve and the pipeline wall caused by the high-speed medium when the valve is at a small opening. At the same time, the horn structure at the valve outlet should also be height-matched to the window 11; in other words, the angles between the lower line 21 and the upper line 22 at the axial section as shown in fig. 1 and the horizontal plane should be different to achieve the matching effect of the window 11 and the pipe at the valve outlet.

It will be understood by those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, but includes other specific forms of the same or similar structures that may be embodied without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.

Claims

1. The offset valve seat comprises a valve seat body (10), wherein a barrel cavity of the valve seat body (10) forms a window (11) for medium to pass through, and the offset valve seat is characterized in that: the window (11) is an eccentric channel, and the eccentric distal end (11 a) of the window (11) is positioned on the side of the valve rod.

2. The biased valve seat as recited in claim 1, wherein: the cross section is taken along the radial direction of the valve seat body (10), and the cross section outline of the window (11) is lip-shaped or rectangular or N-shaped or C-shaped or circular.

3. The biased valve seat as recited in claim 2, wherein: when the cross section of the window (11) is in a lip shape or an N-type or C-type, an arc line formed by the eccentric distal end (11 a) of the window (11) on the cross section and an arc line formed by the outer wall of the valve seat body (10) on the cross section form a concentric circle structure.

4. A orifice plate modulating gate valve employing a biased valve seat as claimed in claim 1 or 2 or 3, wherein: the valve comprises a valve body (20), wherein a valve cavity for fluid to pass is arranged on the valve body (20) in a penetrating way, and a valve seat body (10) with a window (11) is coaxially arranged in the valve cavity; the valve further comprises a valve plate (30), and the valve plate (30) is driven by a valve rod (50) with a power source (40) so as to perform linear reciprocating motion along the radial direction of the valve cavity; a forced sealing wedge block (60) is further arranged in the valve cavity, and a fit clearance for the valve plate (30) to be clamped in and positioned at the valve plate (30) is formed between the forced sealing wedge block (60) and the valve seat body (10), so that after the valve plate (30) is clamped in the fit clearance, the valve plate (30) can be pressed at the fit sealing surface of the valve seat body (10) by means of the pressure of the forced sealing wedge block (60) and the valve seat body (10).

5. The orifice plate regulator gate valve of claim 4, wherein: the forced sealing wedge block (60) is provided with a guide chamfer (61), and the valve plate (30) is correspondingly provided with a matching chamfer (31) with the same angle as the guide chamfer (61), so that after the valve plate (30) is clamped into a matching gap, the guide chamfer (61) and the matching chamfer (31) form a wedge-shaped compression fit with a surface fit.

6. The orifice plate regulator gate valve of claim 4, wherein: the shape of the forced sealing wedge block (60) is in a cylindrical pin shape with an axis parallel to the axis of the valve rod (50).

7. The orifice plate regulator gate valve of claim 4, wherein: the valve outlet of the valve cavity is in an outward-expanding horn-shaped structure, and a liquid inlet of the valve outlet is in smooth transition with a liquid outlet end of a window (11) at the valve seat body (10).

8. The orifice plate regulator gate valve of claim 4, wherein: on an axial section which coincides with the axis of the valve rod (50) and the axis of the valve cavity at the same time, the included angle between the lower straight line (21) of the valve outlet and the horizontal plane is larger than the included angle between the upper straight line (22) and the horizontal plane.

9. The orifice plate regulator gate valve of claim 4, wherein: the lowest part of the window (11) is arranged at the same height with the top surface of the forced sealing wedge block (60) on the axial section which is simultaneously coincident with the axis of the valve rod (50) and the axis of the valve cavity.

10. The orifice plate regulator gate valve of claim 4, wherein: the valve plate (30) and the valve seat body (10) are subjected to wear-resistant treatment.